Superman Vol. 2 (1986-2006) #173

Plot

Strange Visitor, who reveals herself to be the guardian of reality Kismet, makes the ultimate sacrifice in order to power up Superman and destroy Imperiex. But the energy from the destruction of Imperiex, which was planned to be channeled to Apokalips, is instead absorbed by Warworld, whose nearby presence and control under Brainiac 13 is revealed.